Brother HL-820, HL-1020, HL-1040 manual Light, Troubleshooting Image Defects

3.2Troubleshooting Image Defects

The following procedures should be followed in the event of specific image defects.

See subsection 3.3 for information about the location of the high-voltage contacts and grounding contacts.

Caution:

Print quality can not be guaranteed in the following cases;

When using the printer for a special job, such as printing of name cards.

￿When printing much narrower paper than printable paper width.

When printing on one area of the paper continuously even though Letter or A4-size paper is used.

I-1

Light

Possible cause	Step	Check	Result	Remedy	HV.GND
					contacts
					(Fig.4-5)
Toner sensing	1	Can printing be started with the	Yes	Toner sensor failure.
failure		drum unit removed?		Check if the toner
(printer side)				sensor needs
				cleaning and check
				the toner sensor
				connection.
Toner sensing	2	Is the problem solved when 4	Yes	The wiper of the
failure		or 5 pages are printed after the		toner cartridge is
(toner cartridge		toner cartridge is replaced with		defective.
		a full one?
side)				Replace the toner
				cartridge.
Drum	3	Are all the contacts (HV, GND)	No	Clean contact
connection		connected when the drum unit		electrodes both in the	➀
failure		is installed?		printer body and on
				the drum unit.
High-voltage	4	Check the harness connection	No	If the connection is
power supply		between the high-voltage		normal, replace the
PCB failure		power supply PCB and the		high-voltage power
		panel sensor PCB.		supply PCB.
Panel sensor	5	Perform the same check as	No	Replace the panel
PCB or main		step 4 above and also between		sensor PCB or the
PCB failure		the panel sensor PCB and the		main PCB.
		main PCB.
Scanner unit	6	Is the problem solved by	Yes	Replace the scanner
failure		replacing the scanner unit?		unit.

IV-5